Invert alpha bit for map depth 16

Yay295 · Jun 25, 2024 · 4b7464d · 4b7464d
1 parent f91a573
commit 4b7464d
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Showing 3 changed files with 8 additions and 5 deletions.
diff --git a/Tests/images/p_16.png b/Tests/images/p_16.png
diff --git a/Tests/test_file_tga.py b/Tests/test_file_tga.py
@@ -72,12 +72,13 @@ def test_palette_depth_8(tmp_path: Path) -> None:
 
 def test_palette_depth_16(tmp_path: Path) -> None:
     with Image.open("Tests/images/p_16.tga") as im:
-        assert_image_equal_tofile(im.convert("RGB"), "Tests/images/p_16.png")
+        assert im.palette.mode == "RGBA"
+        assert_image_equal_tofile(im.convert("RGBA"), "Tests/images/p_16.png")
 
         out = str(tmp_path / "temp.png")
         im.save(out)
         with Image.open(out) as reloaded:
-            assert_image_equal_tofile(reloaded.convert("RGB"), "Tests/images/p_16.png")
+            assert_image_equal_tofile(reloaded.convert("RGBA"), "Tests/images/p_16.png")
 
 
 def test_id_field() -> None:

diff --git a/src/PIL/TgaImagePlugin.py b/src/PIL/TgaImagePlugin.py
@@ -117,9 +117,11 @@ def _open(self) -> None:
             # read palette
             start, size, mapdepth = i16(s, 3), i16(s, 5), s[7]
             if mapdepth == 16:
-                self.palette = ImagePalette.raw(
-                    "BGRA;15", b"\0" * 2 * start + self.fp.read(2 * size)
-                )
+                colormap = self.fp.read(2 * size)
+                palette_data = bytearray(b"\0" * 2 * start)
+                for a, b in zip(colormap[::2], colormap[1::2]):
+                    palette_data += bytearray((a, b ^ 128))
+                self.palette = ImagePalette.raw("BGRA;15", bytes(palette_data))
                 self.palette.mode = "RGBA"
             elif mapdepth == 24:
                 self.palette = ImagePalette.raw(